| Message ID | 1395934715-31348-2-git-send-email-ashwin.chaugule@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu, Mar 27, 2014 at 10:38 AM, Ashwin Chaugule <ashwin.chaugule@linaro.org> wrote: > The PSCI v0.2+ spec defines standard values for PSCI function IDs. > Add a new binding entry so that pre v0.2 implementations can > use DT entries for function IDs and v0.2+ implementations use > standard entries as defined by the PSCIv0.2 specification. > > Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Acked-by: Rob Herring <robh@kernel.org> > --- > Documentation/devicetree/bindings/arm/psci.txt | 35 +++++++++++++++++++++++++- > 1 file changed, 34 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/arm/psci.txt b/Documentation/devicetree/bindings/arm/psci.txt > index 433afe9..d01a90b 100644 > --- a/Documentation/devicetree/bindings/arm/psci.txt > +++ b/Documentation/devicetree/bindings/arm/psci.txt > @@ -21,7 +21,15 @@ to #0. > > Main node required properties: > > - - compatible : Must be "arm,psci" > + - compatible : should contain at least one of: > + > + * "arm,psci" : for implementations complying to PSCI versions prior to > + 0.2. For these cases function IDs must be provided. > + > + * "arm,psci-0.2" : for implementations complying to PSCI 0.2. Function > + IDs are not required and should be ignored by an OS with PSCI 0.2 > + support, but are permitted to be present for compatibility with > + existing software when "arm,psci" is later in the compatible list. > > - method : The method of calling the PSCI firmware. Permitted > values are: > @@ -45,6 +53,8 @@ Main node optional properties: > > Example: > > +Case 1: PSCI v0.1 only. > + > psci { > compatible = "arm,psci"; > method = "smc"; > @@ -53,3 +63,26 @@ Example: > cpu_on = <0x95c10002>; > migrate = <0x95c10003>; > }; > + > + > +Case 2: PSCI v0.2 only > + > + psci { > + compatible = "arm,psci-0.2"; > + method = "smc"; > + }; > + > +Case 3: PSCI v0.2 and PSCI v0.1. > + > + As described above, for compatibility with existing kernels, the > + hypervisor will likely want to provide IDs, e.g. > + > + psci { > + compatible = "arm,psci-0.2", "arm,psci"; > + method = "hvc"; > + > + cpu_on = < arbitrary value >; > + cpu_off = < arbitrary value >; > + > + ... > + }; > -- > 1.8.3.2 >
diff --git a/Documentation/devicetree/bindings/arm/psci.txt b/Documentation/devicetree/bindings/arm/psci.txt index 433afe9..d01a90b 100644 --- a/Documentation/devicetree/bindings/arm/psci.txt +++ b/Documentation/devicetree/bindings/arm/psci.txt @@ -21,7 +21,15 @@ to #0. Main node required properties: - - compatible : Must be "arm,psci" + - compatible : should contain at least one of: + + * "arm,psci" : for implementations complying to PSCI versions prior to + 0.2. For these cases function IDs must be provided. + + * "arm,psci-0.2" : for implementations complying to PSCI 0.2. Function + IDs are not required and should be ignored by an OS with PSCI 0.2 + support, but are permitted to be present for compatibility with + existing software when "arm,psci" is later in the compatible list. - method : The method of calling the PSCI firmware. Permitted values are: @@ -45,6 +53,8 @@ Main node optional properties: Example: +Case 1: PSCI v0.1 only. + psci { compatible = "arm,psci"; method = "smc"; @@ -53,3 +63,26 @@ Example: cpu_on = <0x95c10002>; migrate = <0x95c10003>; }; + + +Case 2: PSCI v0.2 only + + psci { + compatible = "arm,psci-0.2"; + method = "smc"; + }; + +Case 3: PSCI v0.2 and PSCI v0.1. + + As described above, for compatibility with existing kernels, the + hypervisor will likely want to provide IDs, e.g. + + psci { + compatible = "arm,psci-0.2", "arm,psci"; + method = "hvc"; + + cpu_on = < arbitrary value >; + cpu_off = < arbitrary value >; + + ... + };
The PSCI v0.2+ spec defines standard values for PSCI function IDs. Add a new binding entry so that pre v0.2 implementations can use DT entries for function IDs and v0.2+ implementations use standard entries as defined by the PSCIv0.2 specification. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> --- Documentation/devicetree/bindings/arm/psci.txt | 35 +++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-)